Handle dispatch() directly during event handling

When the message loop is active and we get an incoming dispatch() event,
we'll just handle it directly. In practice this would only be needed
when the event is a response to an `audioMaster()` call made during the
event loop, but we can't know that. This allows the `getProgram()`
during `audioMasterUpdateDisplay()` in REAPER and Renoise to work
correctly. Hopefully this doesn't cause random rare breakage.

src/wine-host/utils.cpp

@@ -16,6 +16,16 @@
 
 #include "utils.h"
 
+PluginContext::PluginContext() : context(), events_timer(context) {}
+
+void PluginContext::run() {
+    context.run();
+}
+
+void PluginContext::stop() {
+    context.stop();
+}
+
 Win32Thread::Win32Thread() : handle(nullptr, nullptr) {}
 
 Win32Timer::Win32Timer(HWND window_handle,